PTFE Encapsulated O-Rings

Encapsulated o-rings are o-rings consisting of a seamless and uniform Teflon encapsulation which completely encloses a rubber core material. Elastomer/rubber core material are a choice of Silicone or Viton. The combination of  these components creates an o-ring that is virtually chemically inert and compression set resistant for use in harsh sealing environments. This combination of chemically resistant polymer jacket over a low-compression set elastomer provides unique properties for a range of demanding applications

PTFE Encapsulated o-rings are o-rings consisting of a seamless and uniform PTFE FEP/PFA encapsulation/jacket which completely encloses a core material Viton® fluoroelastomer (also available in silicone). The combination of these components creates an o-ring that is virtually chemically inert and compression set resistant for use in harsh sealing environments. Encapsulated o-rings will decrease downtime and hence increase profitability wherever corrosive fluids and gases cause premature seal failure.

The PTFE provides a non stick surface for easy cleanup of viscous materials. These o-rings have a low coefficient of friction of .2 on metal and the o-rings surface is self lubricating. The PTFE encapsulation makes the o-rings sanitary by eliminating contamination of fluids by the elastomers. The o-rings are sterilizable and autoclavable, FDA compliant, USP Class VI compliant, NSF compliance available for specific applications.

Encapsulated o-rings are specifically designed to address the problem of sealing the most hostile chemicals and extreme temperature applications. Encapsulated o-rings consist of a solid or hollow elastomeric core encapsulated in a PTFE FEP or PFA sheath. The elastomeric core may be fluorocarbon or silicon rubber. Solid core encapsulated o-rings are generally used in static applications. Hollow Silicone core encapsulated o-rings are commonly used in applications where lower sealing force is required as in semi dynamic applications. The encapsulated o-ring offers an effective solution for many difficult applications. The PTFE FEP or PFA encapsulation actually affects the seal and the elastomeric core insures consistent compression on the seal. The result is an overall sealing compression, increasing with medium pressure. The encapsulated o-ring behaves like a highly viscous fluid, any pressure exerted on the seal is transmitted in all directions. Maximum operating temperature for FEP is 205°C (400°F) and for PFA 260°C (500°F).

Benefits

* Excellent chemical resistance
* Temperature range
  - silicone core: -75°F to 400°F (-60°C to 205°C)
  - flurocarbon core: 5°F to 440°F (-15°C to 205°C)
  - special applications are possible up to 500°F (260°C)
* Overall hardness 85° Shore A ± 5 durometer
* Sterilizable.
* Pressures from vacuum to 10000 psi (700 bar, 70 MPa)
* Low compression set characteristics.
* Anti-adhesive properties, non stick surface, low coefficient of friction
* FDA compliant
* No restrictions on inside diameter